| Message ID | 20250221075058.14180-2-friday.yang@mediatek.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | Add SMI LARBs reset for MediaTek MT8188 SoC | expand |
On Fri, Feb 21, 2025 at 03:50:53PM +0800, Friday Yang wrote: > On the MediaTek platform, some SMI LARBs are directly connected to > the SMI Common, while others are connected to the SMI Sub-Common, > which in turn is connected to the SMI Common. The hardware block > diagram can be described as follows. > > SMI-Common(Smart Multimedia Interface Common) > | > +----------------+------------------+ > | | | > | | | > | | | > | | | > | | | > larb0 SMI-Sub-Common0 SMI-Sub-Common1 > | | | | | > larb1 larb2 larb3 larb7 larb9 > > For previous discussion on the direction of the code modifications, > please refer to: > https://lore.kernel.org/all/CAFGrd9qZhObQXvm2_abqaX83xMLqxjQETB2= > wXpobDWU1CnvkA@mail.gmail.com/ > https://lore.kernel.org/all/CAPDyKFpokXV2gJDgowbixTvOH_5VL3B5H8ey > hP+KJ5Fasm2rFg@mail.gmail.com/ > > On the MediaTek MT8188 SoC platform, we encountered power-off failures > and SMI bus hang issues during camera stress tests. The issue arises > because bus glitches are sometimes produced when MTCMOS powers on or > off. While this is fairly normal, the software must handle these > glitches to avoid mistaking them for transaction signals. What's > more, this issue emerged only after the initial upstreaming of this > binding. Without these patches, the SMI becomes unstable during camera > stress tests. > > The software solutions can be summarized as follows: > > 1. Use CLAMP to disable the SMI sub-common port after turning off the > LARB CG and before turning off the LARB MTCMOS. > 2. Use CLAMP to disable/enable the SMI sub-common port. > 3. Implement an AXI reset for SMI LARBs. > > This patch add '#reset-cells' for the clock controller located in image, > camera and IPE subsystems. > > Signed-off-by: Friday Yang <friday.yang@mediatek.com> Acked-by: Conor Dooley <conor.dooley@microchip.com>
diff --git a/Documentation/devicetree/bindings/clock/mediatek,mt8188-clock.yaml b/Documentation/devicetree/bindings/clock/mediatek,mt8188-clock.yaml index 860570320545..2985c8c717d7 100644 --- a/Documentation/devicetree/bindings/clock/mediatek,mt8188-clock.yaml +++ b/Documentation/devicetree/bindings/clock/mediatek,mt8188-clock.yaml @@ -57,6 +57,27 @@ required: - reg - '#clock-cells' +allOf: + - if: + properties: + compatible: + contains: + enum: + - mediatek,mt8188-camsys-rawa + - mediatek,mt8188-camsys-rawb + - mediatek,mt8188-camsys-yuva + - mediatek,mt8188-camsys-yuvb + - mediatek,mt8188-imgsys-wpe1 + - mediatek,mt8188-imgsys-wpe2 + - mediatek,mt8188-imgsys-wpe3 + - mediatek,mt8188-imgsys1-dip-nr + - mediatek,mt8188-imgsys1-dip-top + - mediatek,mt8188-ipesys + + then: + required: + - '#reset-cells' + additionalProperties: false examples:
On the MediaTek platform, some SMI LARBs are directly connected to the SMI Common, while others are connected to the SMI Sub-Common, which in turn is connected to the SMI Common. The hardware block diagram can be described as follows. SMI-Common(Smart Multimedia Interface Common) | +----------------+------------------+ | | | | | | | | | | | | | | | larb0 SMI-Sub-Common0 SMI-Sub-Common1 | | | | | larb1 larb2 larb3 larb7 larb9 For previous discussion on the direction of the code modifications, please refer to: https://lore.kernel.org/all/CAFGrd9qZhObQXvm2_abqaX83xMLqxjQETB2= wXpobDWU1CnvkA@mail.gmail.com/ https://lore.kernel.org/all/CAPDyKFpokXV2gJDgowbixTvOH_5VL3B5H8ey hP+KJ5Fasm2rFg@mail.gmail.com/ On the MediaTek MT8188 SoC platform, we encountered power-off failures and SMI bus hang issues during camera stress tests. The issue arises because bus glitches are sometimes produced when MTCMOS powers on or off. While this is fairly normal, the software must handle these glitches to avoid mistaking them for transaction signals. What's more, this issue emerged only after the initial upstreaming of this binding. Without these patches, the SMI becomes unstable during camera stress tests. The software solutions can be summarized as follows: 1. Use CLAMP to disable the SMI sub-common port after turning off the LARB CG and before turning off the LARB MTCMOS. 2. Use CLAMP to disable/enable the SMI sub-common port. 3. Implement an AXI reset for SMI LARBs. This patch add '#reset-cells' for the clock controller located in image, camera and IPE subsystems. Signed-off-by: Friday Yang <friday.yang@mediatek.com> --- .../bindings/clock/mediatek,mt8188-clock.yaml | 21 +++++++++++++++++++ 1 file changed, 21 insertions(+) -- 2.46.0